Onset of energy equipartition among surface and body waves
Onset of energy equipartition among surface and body waves
复制标题
表面波和体波之间能量均等的开始
DOI:
10.1098/rspa.2020.0775
复制
发表时间:
2021
影响因子:
--
通讯作者:
Solna, K.
中科院分区:
文献类型:
--
作者:
Borcea, L;Garnier, J;Solna, K.
We derive a radiative transfer equation that accounts for coupling from surface waves to body waves and the other way around. The model is the acoustic wave equation in a two-dimensional waveguide with reflecting boundary. The waveguide has a thin, weakly randomly heterogeneous layer near the top surface, and a thick homogeneous layer beneath it. There are two types of modes that propagate along the axis of the waveguide: those that are almost trapped in the thin layer, and thus model surface waves, and those that penetrate deep in the waveguide, and thus model body waves. The remaining modes are evanescent waves. We introduce a mathematical theory of mode coupling induced by scattering in the thin layer, and derive a radiative transfer equation which quantifies the mean mode power exchange. We study the solution of this equation in the asymptotic limit of infinite width of the waveguide. The main result is a quantification of the rate of convergence of the mean mode powers toward equipartition.
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影响因子:
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DOI:
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发表时间:
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期刊:
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影响因子:
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影响因子:
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DOI:
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期刊:
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影响因子:
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